Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73f2450d788c187…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 04:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df41ca5914a5a4358f5029cbcf8b6df6 SHA-1: c050dbb1a36004677b386354464e2f8aab1bf47b SHA-256: b73f2450d788c1879efc23fae0f061602bfe96b4f48edc776b238db6e1349df8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=ok+ko+lakewood+plaza+turbo+game PDF link annotation
    • https://gesema.com/UserFiles/file/xiluzanakitivaz.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/bubiw.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/gedezotupusitazezi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/fovopozobonumelobo.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/seguzurel.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/80423277433.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/afa83ff0ee632b3bd37d53e5770af353/fezaditarewufoxebake.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/vidiwoxuk.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/97583567300.pdfIn PDF document text
    • http://iucecb.com/files/file/nimimamijebisoxig.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/nopokovulune.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/nejuwuw.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210918_C88B2DA7BAAA0BBE.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kepezajatezud.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/lovajodujebategojizab.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/48764728611.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210906_d2782.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6e6ceccb652b438ef82b1d4b91850821/siparusibezo.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/17665166674.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/norexokowewoguwu.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/terafaluduwa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 17860 bytes
SHA-256: e176e37684b81350da034f71ddbb0cdd45d5a024634313509f35c24f9cc08dd2
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 10876 bytes
SHA-256: 62256b8ed8534dfd12b02e28678fa568912a294ba62be0f2c8682598492bc437
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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